Here are some of my favorite links:

Nexstar 11 GPS
Nexstar GPS Yahoo Group
Dave's Nexstar 11 GPS site
Mike Swanson's Nexstar site
Andre Paquette Nexstar Programming Site

Fastar / Hyperstar Imaging
Darklight Imagery - Chris Anderson
Ray cash's fastar CCD Site
Robert Berta fastar Images
David Barmore
Astroden- Mike Downing
Rancho Del Sol hyperstar Images

ST-237a Imaging
Mike Chapa
Paul Lukas
General St-237 links
Darin E. Fields Astroimaging

General Astrophotography
Robert Gendler
Jerry Logriguss

Image Processing
CCD Imaging Guide
Photoshop Introduction
Removing Vignetting
Digital Techniques
Reducing Star Bloat

Vendors
Celestron
SBIG
Starizona